Arbor



W. E. KELLY.

ARBOR. APPLlArloN FILEDMAR. 1o. 1919.

Patented Dec. 21,1920.

UNITED STATES WILLIAM E. KELLY, OF CLEVELAND, OHIO.

.AIRJBOIELy Application filed March 10,

To all fw 7mm t may concern Be it known that I, IVILLIAM E. KELLY, acitizen of the United States, residing at Cleveland, inthe county ofCuyahoga and j State of Ohio, have invented a new and usestance baclringoff fiat cutters or providing.

clearance thereonv which is accomplished in a very economical andsatisfactory manner with the present invention.

I attain' my object by certain mechanism, one application of which isillustrated in the accompanying drawings which show an arbor for flatcutters and in which Figure I is a plan view ot au arbor adapted togrind fiat cutters; Fig. II is a side elevation of Fio'. I; Fig. III isa section on line 3-3 of II; Fig. IV is an end elevation at lfl of Figs.I and II showing normal positions of centers; Fig. V is also an endelevation o. at 4t showing the centers in an adjusted position; VI is ayplan view of a portion of a cutter grinder arbor showing onemodification; Fig. VII is an end elevation or' Fig. VI; and Fig. VIII isan end elevation of bushing showing the centers in a certain position.

Similar: reference characters refer to similar parts throughout theseveral views.`

In this speciiication I will describe the apparatus shown in thedrawings as adapted to hold a flat cutter while the same is beingground. j

Referring 'now particularly to Figs. I, II, III, IV, and. V.

The body 1, conveniently made of suitable material, hasv theend-portions 2 and 5 which have suitable slots in their ends `intowhich-the center blocks 6.and 7 fit slidingly. In the bottom of theseslots and in proper .1. position, theseend-portions 2 and 5 have atapped opening; into which the clamp- Specfcaton of Letters Patent.

Patented Dec. 21, 1920.

1919. serial No. 281,768.

`screws 8 and 9 t for the purpose of clamping the center-blocks inposition. The central portion of the body 1 is formed as shown; therebeing a slot 1G, the face 11 of which, preferably, is located below thelongitudinal axis of the body. This slot 1() is adapted to accommodatethe cutter which is being held on the body. lflLdjacent to the slot 10and transversely thereto, the body 1 is provided with the slot 13 whichaccommodates the adjusting-block 14. It will be seen that the slot 13 issomewhat wider than the block 14: for the purpose of permitting the sameto move laterally and permit oit' adjustment of the cutter'. Adjacent tothe slot 13 and on each side thereof, the body 1 has a tapped openinginto which the adjusting-screws 15 fit for the purpose of ad* justingthe cutter 16 upon the body 1. Adjacent to the slot 10 and opposite theslot 13, the body 1 has the portion 17 which projects above thelongitudinal `axis" of the body. rIlhis portion 17 has the opening 18into which the clamp-screw 19 fits. To prevent the clamp-screw 19 fromturning, the pilotscrew 2() is tapped into the body 1 in properposition. To provide means for partially or wholly rotating the vbody 1,the handle 21 is screwed into the body l as shown.

The center-blocks 6 and 7, made of suitable material, tit slidinglyinto-the slots in `the end portions 2 and 5 as hereinbefore stated andare Vprovided with the ears 22V which have tapped openings to receivethe adjusting-screws 23 which are provided for the purpose of adjustingthe center-blocks in relation with the body 1. rllhe centerblocks havethe centers 24- which coincide with the zero mark 0 thereon and alsohaver the centers 25 which are located off center as clearly seen inFigs. IV andI. 0n oner edge and along the central portion, thecenter-blocks 6 and 7 have division-marks or graduations whereby theamount of clearance to be given or ground on the cutter 16 may bedetermined-positively and without experimentation while the cutter isbeing ground. rlhe graduations may be spaced and marked in anyconvenient manner; for instance. the niark A may indicate a cutter twoinches in diameter, the marlcB three inches and so forth and thegraduations intermediate these lettered marks, three` between eachlettered marl, will indicatev two and one quarter, ltwo anda half andtwo and three quarter inches,- the object beingl to have a definite markto set the apparatus time and expense saved. rlhe off-centers 25 areprovided for relieving or breaklng the corners 26 and are spacedaccording to the angle to be given this face 26 as will appearhereinafter.

The adjusting-block 14 is located in the slot 13 which is wider than theblock to permit of side-wise adjustment thereof and projects into theslot 10. That portion of the block 14 which so projects into the slot 10should fit the usual centering-notch 27 in the cutter 16.

The screw 19 is provided to clamp the cutter 16 in adjusted position bymeans of the clamp-platef28 and is provided with the slot 12 whichengages the pilot on the pilotscrew 20 for the purpose of preventingrotation of the screw 19 when the nut thereon is turned.

The clamp-plate 28, operated by the screw 19, is provided to clamp thecutter 16 down firmly upon the body 1.

The operation of the apparatus so far described is as follows: Thecutter 16, after being hardened, and provided with the centering-notch27 and is otherwise ready to be ground, isnow placed in the slot 10. Theclamp-plate 28 is then placed thereon as seen in Fig. Il and the screw19 is now slightly tightened whereby the cutter 16 is lightly held uponthe body 1. The adjusting-screws 15 are now manipulated to bring thecutter 16 to a desired position either concentric or eccentric. When thecutter is f in desired position, the clamp-plate 28 is 40 'center-blocks6 and 7 are manipulated,

through the screws 23,'until thev zero-marks 0 on the end of portions 2and 5 coincide with the zero-marks 0 on the center-blocks 6 and 7. Whenboth center-blocks are so ad# justed, the inner ends of all of thescrews 23 should bear against the end-portions 2 and 5 so that thecenter-blocks can not move transversely of the body. When the screws 23are properly set, the screws 8 and 9 are tightened. rlhe screws 23adjust the centerblocks 6 and 7 and also hold the same in adjustedposition sidewise while the screws 8 and 9 clamp the same against thebottom of the slots in the end-portions 2 and 5.

The apparatus is now ready to circular grind the cutter 16 to thelightline L as seen in Fig. IV; by rotating the apparatus partly or wholly onthe centers 24, either by means of a machine or by means of the handle21.

After the cutter is' Circular grau/11d, it is.

necessary that the same be'backed off to provide cutting clearance whichis necessary in all cutters. ln order to accomplish this, in an easy andquick manner, the present invention shifts the centers so that an easilyand economically accomplished circular movement of the apparatus willproduce a uniform and proper and positively determined cutting clearanceon the cutter.

We will now assume that the cutter to be backed off is two and threequarter inches in diameter. As stated hereinbefore, the graduation-markA on the cutter-blocks 6 and 7 represents a cutter two inches indiameter and the mark B represents a cutter three inches in diameter.There being three lines or four spaces between lines A and B,therefore,-each line between A and B represents one quarter of an inchof diameter or, in other words, the line A represents two inches indiameter, the first line from A toward B two and one quarter inches, thesecond line from A toward B two and one half inches, the third line fromA toward B two and three quarter inches, and thenext line, B, threeinches as stated.

In order to set the center-blocks 6 and 7 to properly back o the two andthree quarter inch cutter, the screws 8 and 9 are loosened slightly. Theadjusting-screws 23 are then manipulated until the thirdgraduation-line, from A toward B, on the centerblocks coincide with thezero line 0 on the end of the portions 2 and 5 as seen in Fig. V. Whenthe center-blocks are so adjusted, the inner ends of the screws 23should bear firmly against the end-portions 2. and 5 to prevent lateralmovement of the centerblocks and the screws 8 and 9 are then tightenedto firmly lock the center-blocks in position.

rlhe face 29 of the cutter 16 is now brought in contact with agrinding-wheel and the apparatus as a whole partially rotated, back andforth, on the centers 24 whereby this face 29 will be backed off as seenin Figs. IH and V. The cutter is then reversed on the body and the faceopposite 29 is backed off in a similar manner.

Most cutters require some relief at the cutting point 26. In order toproduce this relief, the centers 25 are provided and are spaced asuitable distance from the centers 24 but preferably in line therewith.In order to relieve a cutter properly it isk preferred that the centersbe shifted as was done in backing off. For that reason theAgrinding-wheel brought against the point 26 will relieve the same at adetermined angle and provide proper clearance thereon. When one point ofthe cutter is so relieved, the cutter is reversed on the body and theopposite point is relieved in like manner.

en a comparatively large number of cutters of one size are to be ground,the more simple but non-adjustable arrangement shown in Figs. VI, VII,and VIII may be preferred to the arrangement shown in Figs. I, II, III,IV, and V.

This arrangement consists of the body 31 which has the end-portions 32which are bored out to receive the bushings 33 which are held inposition and prevented from turning by the pilot-screws 311- which aretapped into the end-portions 32. Only one end of the apparatus is shownon the drawings, the other end is a duplicate of the one shown. Theparts and members not shown in these views are similar to the parts andmembers shown in Figs. I to V.

The bushings 33 fit slidingly but rather close into the bored openingsin the endportions 32 and have the slots 35 which engage the pilots ofthe screws 34: to prevent rotation of the bushings as well as to holdthe same in proper relative position. With this arrangement, it ispreferred and may be necessary that sets or pairs of bushings areprovided to accommodate different sizes of cutters, all of the bushingsshould it properly into the openings provided for that purpose in theends of the end-portions.

For circular-grinding and relieving the cutter 16, hereinbeforedescribed, with this arrangement, a pair of bushings are provided whichhave the centers 36 and 37 in each bushing; the centers 36 as well asthe centers 37 being located axially opposite each other or in otherwords: the centers 36, one in each end, coincide when viewed from theend of the arbor; likewise the centers 37. For relieving a cutter, asalso hereinbefore described, a pair of bushings are provided which havethe centers 39 and al in each bushing; the centers 39 as well as thecenters l1 being located axially opposite each other similar to thecenters 36 and 37.

Owing to limited space, the drawings are not quite as clear as theymight be but should be comprehensive in connection with the particularexplanation given.

To operate this apparatus, the bushings 33 are placed into theirrespective openings and held there by the screws 34. To circular-grind acutter, the apparatus is rotated on the centers 36. To back olf acutter, the apparatus is rotated on the centers 40 and 41. To relieve acutter, the apparatus is rotated on the centers 39 and 41. Theoperations not described in detail here are similar to the operationspreviously described.

The bushings 33 as well as the centerblocks 6 and 7 may be eliminatedwhen cutters of a few sizes only are to be ground continuously; thepairs of centers may, in that case, be drilled directly into the ends ofthe body. In this instance, one arbor may accommodate two or more sizesof cutters and separate pairs of centers may be provided on the body foreach size of cutter.

This arrangement is more limited since only a few sizes of cutters canbe accommodated on one arbor while the arbors formerly described willaccommodate a comparatively large number of cutters.

It will be seen that this invention provides an economical, eiiicient,and positive mechanism for grinding cutters as well as other articlesand operations of a similar nature and conduces to considerable savingof time and labor.

Therefore, without limiting myself to the precise construction shown anddescribed,

I claim:

1. An apparatus of the character described having a body, center-blocksmounted on said body, means for adjusting an article upon said body, andmeans for clamping said article upon said body.

2. An apparatus of the character described comprising a body, acenter-block mounted on each end of said body, a plurality of centers insaid center-blocks, means for holding the said center-blocks inposition, means for adjusting an article upon said body, and means forholding said article upon said body.

3. An apparatus of the character described having a body which isprovided with a surface on one side to fit an article and with aplurality of pairs of centers, and means for holding said article uponsaid surface.

4L. An apparatus of the character described having a body which isprovided with a plurality of pairs of centers, means for adjusting anarticle upon said body, and means for clamping said article upon saidbody.

5. An apparatus of the character described having a body, a pair ofcenterblocks mounted on said body,l each centerbloclr provided with aplurality of centers, and means for holding an article upon said body.

WM. E. KELLY.

